MOBILE TELEPHONE COMMUNICATION SYSTEM, PAYMENT TECHNIQUE FOR TERMINAL EQUIPMENT OF MOBILE TELEPHONE EXCHANGE, AND SYSTEM IMPLEMENTING IT Russian patent published in 1998 - IPC

FIELD: techniques and systems using cards, especially service cards of subscriber identification module. SUBSTANCE: system uses service cards of subscriber identification module or unit incorporating subscriber identification module cards of mobile digital communication network (GSM network) for various electronic service systems. EFFECT: improved efficiency of protection of transmitted data. 10 cl, 3 dwg